It is intensive training - and it is meant to be such.
I mean 140 hrs and you find yourself behind the boat - solo as mentioned - for the first time; it is more of a gut check than anything else!
It is very structured training though. You don't step out of the boundaries very often. I guess it is much like some P141 schools that won't let you wander too far off the reservation or let you touch a cloud for an instant of actual IMC.
A guy at that level can get all briefed up, find his way out to the jet, start up, takeoff, join up, and fly out to a working area; but throw in some unusual circumstances and you'll often see a big blank stare. It doesn't go away until quite a bit of experience later in the fleet is gained in my opinion (one reason why I'm not a fan of the reduced hours for ATP).
Even after many years of that type of flying, I always say that I feel like a MUCH better, and well rounded, pilot now that I've been flying professionally for a few years out in the civilian world.